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918
Pfaff 918 Adjustment Manual
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Adjustment
45
1
.07
Adjusting the thread trimmer -90
0/24
1
.07
.0
1
Axial position of the control cam
Fig. 1 - 38
ā
Shif
t control cam
1
(screw
2)
and adjustment ring
3
(scre
w
4)
in accordance with the
re-
quirement
s.
Requirement
1
. Roller
5
should be at a distance of
0.3 mm
from the control cam
1.
2. Adjustment
ring
3
should be touc
hing the control cam
1.
1
2
3
4
4
0,3 mm
44
46
Table of Contents
Table of Contents
3
Tools, Gauges and Other Accessories for Adjusting
5
Abbreviations
5
Explanation of the Symbols
5
Check and Adjustment Aid
6
Adjusting the Basic Machine
7
Balancing Weight
7
Centering the Needle in the Needle Hole (in Sewing Direction)
8
Parallel Guiding of the Needle Bar
9
Locking Lever
10
Zero Stitch and Zigzag Stitch Scale
11
Centering the Needle in the Needle Hole (Crosswise to Sewing Direction)
12
Zigzag Stitch Width
13
Zigzag Stitch Movement (Only on the 918 and 938)
14
Needle Penetration Symmetry - Left, Centre and Right (Only on the 918 and 938)
15
Multi-Stitch Movement (Only on the 918U and 938U)
16
Zigzag Movement (Only on the 918U and 938U)
17
Target Positioning Sensor (Only on the 918U and 938U)
18
Needle Position Adjustment Lever
19
Zero Position of the Bottom Feed Dog (with Closed Gear Box)
20
Zeroing the Bottom Feed (with Open Gearbox)
21
Feeding Motion of the Bottom Feed Dog
22
Lifting Motion of the Bottom Feed Dog
23
Drive Belt in the Gearbox Housing
24
Hook Bearing Bracket
25
Hook Lubrication
26
Pre-Adjusting the Needle Height
27
Needle Rise, Hook-To-Needle Clearance and Bobbin Case Positioning-Fi Nger
28
Final Adjustment of the Needle Height
29
Bobbin Case Opener Position
30
Bobbin Case Opener Motion
31
Bottom Feed Dog Height
32
Presser Foot to Needle Plate Clearance
33
Presser Foot Pressure
34
Needle Thread Tension Release (on Machines Without -900/24)
35
Thread Diverter Pin
36
Limiting the Knee Lever Stroke
37
Knee Lever Play
38
Bobbin Winder
39
Adjusting the Underedge Trimmer -771//05
40
Resting Position of the Knife
40
Knife Height
41
Positioning of the Knife
42
Knife Drive Switch
43
Workpiece Guard
44
Adjusting the Thread Trimmer -900/24
45
Axial Position of the Control Cam
45
Preliminary Adjustment of the Control Cam
46
Position of the Thread Catcher and Cutting Test
47
Readjustment of the Control Cam
48
Needle Thread Tension Release
49
Circuit Diagrams
50
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Pfaff 918 Specifications
General
Brand
Pfaff
Model
918
Category
Sewing Machine
Language
English
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